science exam 2
They all have a different number of neutrons. They have the same atomics number and protons but different number of neutrons.
A sample of calcium-40, calcium-44, calcium-42, calcium-48, calcium-43, and calcium-46 atoms. Please explain, in complete sentences, why these atoms can have different mass numbers but must have the same atomic number.
A. the ratio of their masses is always the same.
According to John Dalton's observations, when elements combine in a compound. A. the ratio of their masses is always the same. B. each element contributes an equal number of atoms. C. their volumes are always equal. D. their masses are always equal
B. group number
Alkali metals, alkaline earth metals, and aluminum all form ions with positive charges equal to the A. atomic number B. group number C. period D. atomic mass
B. right, left
As you move from _________ to ___________ across the periodic table,the elements become more like the metals cesium a. left, right B. right, left
A. increase
As you move from left to right across a period, the number of valence electrons A. increase B. increases and then decreases C. stays the same D. decreases
D. Gases
At room temperature, none of the metals are A. soft B. Malleable C. liquids D. Gases
D. water has a higher boiling point than carbon dioxide does.
Because water molecules are polar and carbon dioxide molecules are non polar. A. water has a lower boiling point than carbon dioxide does. B. attractions between water molecules are weaker than attractions between carbon dioxide molecules. C. carbon dioxide cannot exists as a solid D. water has a higher boiling point than carbon dioxide does.
C. BeCI2
Beryllium, Be and chloride, CI, form a binary ionic compound with a one-to-two ratio of beryllium ions to chloride ions. The formula for the compound A. Be2CI B. 2BeCI C. BeCI2 D. Be2CI2
CCl3
Carbon Tetrachloride
The color change between when elements is in it's ground state it doesn't put anything off. Then it goes into the higher energy level and as it decreases it gives off light.
Explain, what the colors in a fireworks display reveal about the movement of electrons in atoms.
B. lithium fluoride
Fluorine F, forms a binary ionic compound with lithium Li What is the name of this compound? A. fluorine lithide B. lithium fluoride C. lithium fluorine D. fluorine lithium
A. 7
Group 17 or VIIA has how many valence electrons? A. 7 B. 8 C. 17 D. 18
A. Carbon makes the lattice harder and stronger.
How does increasing the amount of carbon in steel affect its properties? A. Carbon makes the lattice harder and stronger. B. Carbon forms an oxide that protects the steel from rusting. C. Carbon makes the steel light enough to use for airplane parts. D. Carbon makes the steel softer and easier to cut.
D. It described a nucleus surrounded by a large volume of space.
How was Bohr's atomic model similar to Rutherford's model? A. It assigned energy levels to electrons B. It described electron positive in terms of the electrons cloud model. C. It described how electrons gain or lose energy D. It described a nucleus surrounded by a large volume of space.
C. like planets orbiting the sun.
In Niels Bohr's model of the atom electrons move A. like balls rolling down a hill B. like popcorn in a popcorn popper C. like planets orbiting the sun. D. like beach balls on water waves
D. row to row
In a periodic table, a set of properties repeats from A. element to element B. column to column C. group to group D. row to row
D. electrons are not shared equally between atoms
In a polar covalent bond, A. electrons are started equally between atoms B. a cation is bonded to an anion C. electrons are transferred between atoms. D. electrons are not shared equally between atoms
A. concentrated in the center of an atom.
In an atomic model that includes a nucleus, positive charge is A. concentrated in the center of an atom. B. spread evenly throughout an atom. C. concentrated at multiple sites in an atom. D. located in the space outside the nucleus
D. the nucleus and all non valence electrons
In an electron dot diagram, the symbol for an element is used to represent A. the nucleus B. The nucleus and all electrons C. the nucleus and valence electrons D. the nucleus and all non valence electrons
D. there are two chloride ions for each magnesium ion
In the compound MgCI2, the subscript 2 indicates that A. there are two magnesium ions for each ion of chlorine. B. the chloride ion is twice the size of the magnesium ion C. magnesium and chlorine form a double covalent bond D. there are two chloride ions for each magnesium ion
B. two oxygen atoms
In the name carbon dioxide, the prefix of the second word indicates that a molecule of carbon dioxide contains A. two carbon atoms B. two oxygen atoms C. a polyatomic ion D. an ionic bond
C. increase from left to right across a period
Ionization energies tend to A. decrease from left to right across a period B. increase from the top of a group to the bottom C. increase from left to right across a period D. decrease from the bottom of the group to the top.
B. contains negatively charged particles
JJ Thompson's experiments provided evidence that an atom A. is the smallest particle of matter B. contains negatively charged particles C. has a negative charge D. has a positive charge
A. cations are still surrounded by electrons when they shift their positions in the lattice
Many metals can be drawn into thin wires without breaking because A. cations are still surrounded by electrons when they shift their positions in the lattice B. metals generally have low melting points C. when a metal is struck with a hammer, the positions of the anions do not change D. electrons have fixed positions in a metallic lattice.
D. mass
Menedeleev arranged the known chemical elements in a table according to increasing A. atomic number B. number of protons C. number of electrons D. mass
C. atomic number
Moving from left to right across a row of the periodic table, which of the following values increases by exactly one from element to element? A. isotope number B. atomic mass unit C. atomic number D. mass number
C. 10
On the current periodic table for physical science class, there are ______ columns. A. 7 B. 8 C. 10 D. 18
C. 114
On the current periodic table for physical science class, there are ________ named elements. A. 110 B. 112 C. 114 D. 116
B.7
On the current periodic table for physical science, there are _________ periods. A. 6 B. 7 C. 8 D. 9
A. a group or family
On the periodic table, a column(up and down) is called A. a group or family B. a period C. a row D. a series
B. a period
On the periodic table, a horizontal row is called A. a group or family B. a period C. a column D. a series
D. There is a dense, positively charged mass in the center of an atom.
Rutherford's gold foil experience provided evidence for which of the following statements? A. Negative and positive charges are spread evenly throughout an atom B. Alpha particles have a positive charge C. Gold is not as dense as previously thought D. There is a dense, positively charged mass in the center of an atom.
/
S2O4
D. The number of protons in the nucleus does not equal the number of neutrons
Suppose an atom has a mass number of 23. Which statement is true beyond any doubt? A. The atom has an odd number of neutrons B. The atomic number is less than 11 C. The atom in not an isotope D. The number of protons in the nucleus does not equal the number of neutrons
C. atom
The Greek philosopher Democritus coined what word for a tiny piece of matter that cannot be divided? A. element B. electron C. atom D. molecule
A. Carbon Family
The called of the 14 or IVA family is called A. Carbon Family B. Nitrogen Family C. Oxygen Family D. Halogens E. Noble Gases
D. nuclei in the gold atoms
The diagram shows the results of the Rutherford's gold foil experience. What caused some of the alpha particles to bounce straight back from the gold foil? A.electrons in the gold atoms B. other alpha particles C. negative charge in the gold atoms D. nuclei in the gold atoms
C. halogens
The element most likely to form more than one type of ion are the A. transition metals B. Alkali metals C. halogens D. alkaline earth metals
A. transfer of electrons
The formation of an ionic bond involves the A. transfer of electrons B. transfer of neutrons C. transfer of protons D. sharing of electrons
C. move from higher to lower energy levels
The glowing of a neon light is caused by electrons emitting energy as they A. move from lower to higher energy levels B. collide with other electrons C. move from higher to lower energy levels D. collide with the nucleus
C. Atomic number
The modern periodic table is arranged by A. Average atomic mass B. Atomic mass of the neutral element C. Atomic number D. The number of neutrons
B. iron ions with a 2+ charge
The name iron (II) indicates that a compound contains A. iron ion with an 11+ charge B. iron ions with a 2+ charge C. iron ions with a negative charge D. two types of iron ions
B. Alkali Metals
The name of the 1 or IA family is called A. Alkaline Earth Metals B. Alkali Metals C. Transition Metals D. Actinide Series E. Lanthanides
B. Nitrogen Family
The name of the 15 or VA family is called A. Carbon Family B. Nitrogen Family C. Oxygen Family D. Halogens E. Noble Gases
C. Oxygen Family
The name of the 16 or VIA family is called A. Carbon Family B. Nitrogen Family C. Oxygen Family D. Halogen E. Noble Gases
D. Halogens
The name of the 17 or VIIA family is called A. Carbon Family B. Nitrogen Family C. Oxygen Family D. Halogens E. Noble Gases
E. Noble Gases
The name of the 18 or VIIA family is called A. Carbon Family B. Nitrogen Family C. Oxygen Family D.Halogens E. Noble Gases
A. Alkaline Earth Metals
The name of the 2 or IIA family is called A. Alkaline Earth Metals B. Alkali Metals C. Transition Metals D. Actinide Series E. Lanthanides
C. Transition Metals
The name of the 3 through 12 columns are called A. Alkaline Earth Metals B. Alkali Metals C. Transition Metals D. Actinide Series E. Lanthanides
E. Lanthanides
The name of the elements 57 through 71 are called A. Alkaline Earth Metals B. Alkali Metals C. Transition Metals D. Actinide Series E. Lanthanides
D. Actinide Series
The name of the elements 89 through 103 are called A. Alkaline Earth Metals B. Alkali Metals C. Transition Metals D. Actinide Series E. Lanthanides
B. atomic number
The number of protons in one atom of an element is that element's A. mass number B. atomic number C. balance charge D. isotope
C. H2 N2 O2 F2 Ci2 Br2 I2
The seven diatonic elements are A. H2Li, NA K Rb, Cs, Fr B. Sc, Ti, V, Cr, Mn, Fe, Co C. H2 N2 O2 F2 Ci2 Br2 I2 D. F2 Ci2 Br2 I2 At2 S2 Se2
D. carbon-12 atom
The standard on which the atomic mass unit is based is the mass of a A. proton B. chorine-35 atom C. neutron D. carbon-12 atom
C. the discovery of elements with predicted properties
The usefulness of Mendeleev's periodic table was confirmed by A. the discovery of subatomic particles B. It's immediate acceptance by other scientists C. the discovery of elements with predicted properties D. the discovery of the nucleus
C. its molecule has a bent shape
The water molecule H2O is polar because it contains two polar single bonds and its molecule has a linear shape. A. its molecule has a linear shape B. molecules that contain polar bonds are always polar C. its molecule has a bent shape D. the attractions between water molecules are strong
A. Argon
This gas when electrified, gives the orange glow you know as what type of lights A. Argon B. Mercury C. Neon D. Xenon E. None of these
C. A stable electron configuration
Typically, atoms gain or lose electrons to achieve A. an exchange of energy B. ionization C. A stable electron configuration D. Vaporization
D. of the strong attractions between polar water molecules.
Water has a higher boiling point than expected because A. there is so much water vapor in the atmosphere. B. water molecules are not very massive. C. hydrogen and oxygen form single covalent bonds. D. of the strong attractions between polar water molecules.
B. The electron has gained energy
What can you assume has happened if an electron moves to a higher energy level? A. The atom has become more stable B. The electron has gained energy C. The electron has lost energy D. The atom has lost an electron
A. probability
What do scientists use to predict the locations of electrons in atoms? A. probability B. geometry C. algebra D. ratios and proportions
A. the most likely locations of electrons in atoms
What does the electron cloud model describe? A. the most likely locations of electrons in atoms B. the precise locations of electrons in atoms C. the number of electrons in an atom D. the mass of the electrons in an atom
C. The atom in an excited state has more energy and less stable than the atom in the ground state.
What is the difference between an atom in the ground state and an atom in an exited state? A. The atom in the ground state has less energy and less stable than the atom in an excited state. B. The atom in an excited state has one fewer electron than the atom in the ground state. C. The atom in an excited state has more energy and less stable than the atom in the ground state. D. The atom in an excited state has one more electron than the atom in the ground state.
C. diatomic molecule
When two atoms of the same nonmetal react, they often form a(an) A. ionic bond B. polyatomic ion C. diatomic molecule D. polar molecule
D. Carbon
Which element is found in most of the compounds in your body except for water? A. iodine B. Iron C. Potassium D. Carbon
C. Oxygen Family
Which group is referred to as the chalcogens? A. Carbon Family B. Nitrogen Family C. Oxygen Family D. Halogens E. Noble Gases
B. Nitrogen Family
Which group is referred to as the pnictogens? A. Carbon Family B. Nitrogen Family C. Oxygen Family D. Halogens E. Noble Gases
A. Alkaline Earth Metals
Which group or family has 2 valence electrons? A. Alkaline Earth Metals B. Alkali Metals C. Transition Metals D. Actinide Series E. Lanthanides series
A. Carbon Family
Which group or family has 4 valance electrons? A. Carbon Family B. Nitrogen Family C. Oxygen Family D. Halogens E. Noble Gases
E. Lanthanides series
Which group or family is also known as the rare earth metals? A. Alkaline Earth Metals B. Alkali Metals C. Transition Metals D. Actinide Series E. Lanthanides series
C. tin, copper, cesium
Which list of elements contains only metals? A. carbon, iodine, tin B. Helium, iron, copper C. tin, copper, cesium D. iodine, carbon, argon
A. N=N
Which of the following formulas represents compound whose molecules contain a triple bond? A. N=N B. O=O=O C. O3 D. SO3
C. Atoms contain subatomic particles.
Which of the following is NOT part of John Dalton's atomic theory? A. All elements are composed of atoms. B. All atoms of the same elements have the same mass. C. Atoms contain subatomic particles. D. A compound contains atoms of more than one element.
C. tendency to shatter when struck
Which of the following is a typical property of an ionic compound? A. low melting point B. poor conductor of electric current when melted. C. tendency to shatter when struck D. all of the above
B. the number of protons
Which of the following is unique for any given element? A. the number of neutrons B. the number of protons C. the charge on the electrons D. the mass of the neutron
D. the attraction between a metal cation and a shared "sea of electrons"
Which phrase best describes a metallic bond? A. a bond that is formed by a metal B. the attraction between a metal anion C. a bond that forms between a metal anion and a shared pool of electrons D. the attraction between a metal cation and a shared "sea of electrons"
A. an electron has the same amount of energy in all orbitals.
Which statement about electrons and atomic orbitals is NOT true? A. an electron has the same amount of energy in all orbitals. B. An orbital can contain a maximum of two electrons C. An electron cloud represents all the orbitals in an atom. D. An atom's lowest energy level has only one orbital
C. Electrons in a metal lattice are free to move
Which statement about metals is true? A. a metal lattice is extremely rigid B. the bonds within a metal lattice are weak. C. Electrons in a metal lattice are free to move D. Generally, metals have a low melting point
D. Protons and neutrons have the same charge
Which statement about subatomic particles is NOT true? A. Protons and neutrons have almost the same mass. B. Protons and electrons have opposite charges. C. Unlike protons and electrons, neutrons have no charge D. Protons and neutrons have the same charge
D. Liquid sodium chloride is a good conductor of electric current.
Which statement best describes the properties if sodium chloride? A. Sodium chloride is a malleable solid. B. Solid sodium chloride is a good conductor of electric current C. Sodium chloride has a low melting point. D. Liquid sodium chloride is a good conductor of electric current.
C. They are isotopes of oxygen
Which statement is true about oxygen -17 and oxygen-18? A. They do not have the same number of protons. B. Their atoms have an identical mass. C. They are isotopes of oxygen D. The have the same mass number.
B. Electrons travels around the nucleus in fixed energy levels with energies that vary from level to level.
Which statements accurately represents the arrangement of electrons in Bohr's atomic model? A. Electrons vibrate in fixed locations around the nucleus B. Electrons travels around the nucleus in fixed energy levels with energies that vary from level to level. C. Electrons travel around the nucleus in fixed energy levels with equal amount amounts of energy. D. Electrons travel randomly in the relatively large space outside the nucleus.
A. electron
Which subatomic particle has a negative charge ? A. electron B. neutron C. proton
B. covalent
You see a structural formula in which the symbols for elements are connected by a long dash.You can assume that the chemical bonds in the compound are A. ionic B. covalent C. metallic D. unstable
B. There is one to one ratio of potassium ions to iodide ions.
\AQWhich of the following statement correctly describes the substance with the formula KI? A. molecules of potassium iodide contain one atom of potassium and one atom of iodine B. There is one to one ratio of potassium ions to iodide ions. C. Potassium iodide is a molecular compound. D. Potassium iodide is a polyatomic ion
B. NaCI
which of the following compounds does NOT contain molecules? A. H2 B. NaCI C. CO2 D. H2O